Hardinger seal
From Tardis Wiki, the free Doctor Who reference
A Hardinger seal was a type of lock that hermetically sealed an area, rendering it impenetrable by either water or air. The central dome of Bowie Base One used Hardinger seals, which prevented crewmembers infected by the Flood from getting into it. (The Waters of Mars [+]Loading...["The Waters of Mars (TV story)"])
